(12-28-2022, 01:05 PM)mikesez Wrote:

(12-28-2022, 08:41 AM)jagibelieve Wrote: Not true.  Our heat pump maintains a comfortable 68 degrees in our home with outside temps in the low 20's.

In the US heat pumps are customarily installed with a resistance heating coil in the air handler.  If your air handler is on a 2 pole or 240V breaker, that's why.  The whole thing is sold as a package without explanation of the components.  I would be very surprised if your home did not have this.
Below 40F, the heat pump starts moving much less heat, even though the home needs more.  Below 25F, it moves no heat at all.  Below 32F, there is the possibility of icing over the coils, if the air is humid, which usually makes the thing shut down

The resistive heating coils are called Emergency Heat and will show on the thermostat if energized. At least on my system. I haven't seen it, so far. I'm truly curious how low the temperature has to be outside before it kicks on. However, I don't go crazy with the thermostat. It gets set to 65 at night and bumped up to 68 or 69 in the morning.

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